If fresh flowers of the plant be steeped for twenty-one days in olive oil whilst exposed to the sunlight, this makes an admirable bactericide; also by simply instilling a few drops two or three times a day into the ear, all pain therein, or discharges therefrom, and consequent deafness, will be effectually cured, as well as any itching eczema of the external ear and its canal.
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie
The word disinfectant is synonymous with the term bactericide or germicide.
"A Practical Physiology"
Albert F. Blaisdell
Lactic Acid as a bactericide.
"Psychotherapy"
James J. Walsh